potrzebuje całego rozwiązania układów równań
7(x-y)+8(x+y)=-14
7x-8y=-15
x+y=468
x=0,04y
x+y=110
x=120%y
x+y=10
5%x+30%y=10*10%
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7(x-y)+8(x+y)=-14
7x-8y=-15
7x-7y+8x+8y=-14
7x-8y=-15
15x+y=-14
7x-8y=-15
y=-14-15x
7x-8(-14-15x)=-15
y=-14-15x
7x+112+120x=-15
y=-14-15x
127x=-127 /:127
x=-1
y=-14-15(-1)
x=-1
y=1
b)x+y=468
x=0,04y
0,04y+y=468
x=0,04y
1,04y=468 /:1,04
x=0,04y
x=18
y=450
c) x+y=110
x=120%y
x+y=110
x=1,20y
1,20y+y=110
x=1,20y
2,20y=110 /:2,20
x=1,20y
y=50
x=1,20*50
x=60
y=50
d) x+y=10
5%x+30%y=10*10%
x+y=10
0,5x+0,30y=1
x=10-y
0,5(10-y)+0,30y=1
x=10-y
5-0,5y+0,30y=1
x=10-y
-0,2y=-4 /:(-0,2)
x=10-y
y=20
x=10-20
y=20
x=-10
y=20
7(x-y)+8(x+y)=-14
7x-8y=-15
7x-7y+8x+8y=-14
7x-8y=-15
15x+y=-14
7x-8y=-15
y=-14-15x
7x-8(-14-15x)=-15
y=-14-15x
7x+112+120x=-15
y=-14-15x
127x=-127 /:127
x=-1
y=-14-15(-1)
x=-1
y=1